Question

Which of the following combination, of compounds/elements and its packing fraction is true?
Assume all cations or anions are ideally fitted in the voids without any distortion in lattice.
A. `Na_(2)O, phi=(pi)/(3sqrt(2)) {1+2xx(0.225)^(3)}`
B. `Cr_(2)O_(3),phi=(pi)/(3sqrt(2)){1+ 2/3xx(0.414)^(3)}`
C. `Fe_(2), O_(3), phi=(pi)/(3sqrt(2)){1+(0.225)^(3)}`
D. Diamond, `phi=(pi)/(3sqrt(2)){1+(0.414)^(3)}`

Answer 1

Correct Answer - A::B
`Fe_(2)O_(3), phi=(pi)/(3sqrt(2)){1+2/3(0.414)^(3)}`
Diamond `phi=8xx(4pir^(3))/(3xx(2sqrt(2)R)^(3))`